A note on the projection from the rostral thalamus to the visual hyperstriatum of the chicken (Gallus gallus)

Ehrlich, David; Stuchbery, John

doi:10.1007/bf00237418

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Area pretectalis is related to pupillary reflex circuitry (Gamlin et al, 1984). The known connections of the nucleus lateralis anterior are largely uninformative with respect to the functional relevance of this nucleus (Boxer and Stanford, 1985;Ehrlich and Stuchbery, 1986;Kuenzel and Blä hser, 1991;Székely et al, 1994). The accessory visual reflexes and the pupillary reflexes are originated in ganglion cells with large receptive fields (Burns and Wallman, 1981;Morgan and Frost, 1981;Bodnarenko et al, 1988;Gamlin and Cohen, 1988).…”

Section: Cadherins As Markers For Different Populations Of Optic Neurmentioning

confidence: 99%

Cadherin expression in the retina and retinofugal pathways of the chicken embryo

et al. 1998

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The expression of two calcium-dependent adhesion molecules of the cadherin superfamily (cadherin-6B and cadherin-7) was mapped in the embryonic neural retina and retinofugal pathways of the chicken embryo and compared with the expression of R-cadherin, N-cadherin, and B-cadherin, studied previously. Whereas B-cadherin is only found in Miller glia, the other four cadherins are each expressed by specific subpopulations of retinal neurons. For example, different (but partly overlapping) populations of bipolar cells express R-cadherin, cadherin-6B, and cadherin-7. Cadherin-6B and cadherin-7 are also expressed by subsets of amacrine cells. In the inner plexiform layer, cadherin-6B and cadherin-7 immunoreactivities are restricted to specific sublaminae associated with synapsin-I-positive nerve terminals. In addition, cadherin-6B and cadherin-7 are expressed by a subset of ganglion cells that project to several retinorecipient nuclei forming part of the accessory optic system (e.g., nucleus of the basal optic root and external pretectal nucleus). Together with their connecting fiber tracts, these nuclei also express cadherin-6B and cadherin-7 in their neurons and neuropile. The expression patterns of the two cadherins overlap but show distinct differences. Some other visual nuclei express cadherin-7 but not cadherin-6B. The expression patterns differ from those previously described for N- and R-cadherin. Together, these results demonstrate that cadherins could provide a system of adhesive cues that specify developing retinal circuits and other functional connections and subsystems in the embryonic chicken visual system.

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Section: Cadherins As Markers For Different Populations Of Optic Neurmentioning

confidence: 99%

Cadherin expression in the retina and retinofugal pathways of the chicken embryo

et al. 1998

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“…In vertebrates, the typical pattern of visual system organization is the presence of two ascending pathways to the telencephalon (Karten & Shimizu, 1991). The avian thalamofugal pathway involves projections from the retina to the nucleus opticus principalis thalami (OPT) in the thalamus, and projections from OPT to the visual Wulst in the telencephalon by means of a distinct fiber bundle known as the fronto-thalamic tract (FT) (Karten & Nauta, 1968;Karten et al, 1973;Bravo & Pettigrew, 1981;Nixdorf & Bischof, 1982;Bagnoli & Burkhalter, 1983;Watanabe et al, 1983;Miceli & Rep6rant, 1985;Ehrlich & Stuchberry, 1986;Watanabe, 1987;Bagnoli et al, 1990;Miceli et al, 1990). Within the tectofugal division of the avian visual system, the rotundo-ectostriatal pathway is the main ascending pathway (Karten & Revzin, 1966;Nixdorf & Bischof, 1982;Watanabe et al, 1985), although other ascending projections from the optic tectum include the triangularis-ectostriatal pathway (Benowitz & Karten, 1976) and the pathway from the dorsolateralis posterior nucleus (DLP) to the DLP projection zone in neostriatum (Kitt & Brauth, 1982;Gamlin & Cohen, 1986).…”

Section: Introductionmentioning

confidence: 99%

Hyperstriatum ventrale in pigeons: Effects of lesions on color-discrimination and color-reversal learning

Chaves

Hodos

1997

Vis Neurosci

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Previous lesion studies of color-reversal learning in pigeons show that an impairment results when (1) the tectofugal visual pathway is damaged at either the thalamic level (nucleus rotundus) or the telencephalic level (ectostriatum), or (2) the thalamofugal visual pathway is damaged at the telencephalic level (the visual Wulst). An impairment does not result, however, when the thalamic source of thalamofugal input (n. opticus principalis thalami or OPT) to the visual Wulst is damaged. These results suggest that the visual Wulst plays a role in color-reversal learning as a consequence of visual information routed from the tectofugal pathway via other visual areas in the telencephalon. One such area is the hyperstriatum ventrale (HV). In the present study, after ablation of the medial and lateral regions of HV, pigeons were trained postoperatively to discriminate between two colors presented simultaneously. After reaching criterion, the pigeons were required to perform a series of discrimination reversals in which the positive and negative stimuli were interchanged. Lesions of medial HV resulted in impaired performance of a color-discrimination task (i.e. original learning), but did not affect discrimination reversal. An impairment in color-reversal learning resulted from combined damage to lateral HV and the fronto-thalamic tract (FT), which carries ascending visual input from OPT to the visual Wulst. No deficits were observed when either lateral HV or FT were damaged alone. These findings suggest that both the thalamofugal and tectofugal pathways provide the visual Wulst with visual input relevant to color-reversal learning.

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An immunocytochemical analysis of the lateral geniculate complex in the pigeon (Columba livia)

Güntürkün

Karten

1991

J of Comparative Neurology

103

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The lateral geniculate complex (GL) of pigeons was investigated with respect to its immunohistochemical characteristics, retinal afferents, and the putative transmitters/modulators of its neurons. The distributions of serotonin-, choline acetyltransferase-, glutamic acid decarboxylase-, tyrosine hydroxylase-, neuropeptide Y- (NPY), substance P- (SP), neurotensin- (NT), cholecystokinin- (CCK), and leucine-enkephalin- (L-ENK) like immunoreactive perikarya and fibers were mapped. Retinal projections were studied following injections of Rhodamine-B-isothiocyanate into the vitreous. Transmitter-specific projections onto the visual Wulst and the optic tectum were studied by simultaneous double-labelling of retrograde tracer molecules and immunocytochemical labelling. The GL can be divided into three major subdivisions, the n. geniculatus lateralis, pars dorsalis (GLd; previously designated as the n. opticus principalis thalami, OPT), the n. marginalis tractus optici (nMOT), and the n. geniculatus lateralis, pars ventralis (GLv). All three subdivisions are retinorecipient. The GLd can be further subdivided into at least five components differing in their immunohistochemical characteristics: n. lateralis anterior (LA); n. dorsolateralis anterior thalami, pars lateralis (DLL), n. dorsolateralis anterior thalami, pars magnocellularis (DLAmc); n. lateralis dorsalis nuclei optici principalis thalami (LdOPT); and n. suprarotundus (SpRt). The LdOPT consists of an area of dense CCK-like and NT-like terminals of probable retinal origin. Three subnuclei (DLL, DLAmc, SpRt) were shown to project to the visual Wulst. Cholinergic and cholecystokinergic relay neurons participated in this projection. The nMOT occupies a position between the GLd and GLv and encircles the rostral pole of n. rotundus and the LA. It is characterized mainly by medium sized NPY-like perikarya which were shown to project onto the ipsilateral optic tectum. Bands of NPY-like fibers in the tectal layers 2, 4, and 7 could at least in part be due to this projection of the nMOT. Most of the antisera used revealed transmitter/modulator-specific fiber systems in the GLv which often showed a layer-specific distribution. Perikaryal labelling was only obtained with glutamic acid decarboxylase. On the basis of its chemoarchitectonics, topography, and connectional pattern, the GLd complex of pigeons is most directly equivalent to the mammalian GLd. However, although the different subdivisions of the avian GLd may represent functionally different channels within the thalamofugal pathway similar to the lamina-specific differentiation within the mammalian geniculostriate projection, direct comparison of subnuclei of birds and mammals is not justified at this time. The nMOT appears similar to the intergeniculate leaflet (IGL) and the avian GLv clearly corresponds in many features to the mammalian GLv.

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A note on the projection from the rostral thalamus to the visual hyperstriatum of the chicken (Gallus gallus)

Cited by 8 publications

References 19 publications

Cadherin expression in the retina and retinofugal pathways of the chicken embryo

Cadherin expression in the retina and retinofugal pathways of the chicken embryo

Hyperstriatum ventrale in pigeons: Effects of lesions on color-discrimination and color-reversal learning

An immunocytochemical analysis of the lateral geniculate complex in the pigeon (Columba livia)

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